Right-click on the entity with the item

The problem may be one of the following:

1. You didn't add the procedure (which I doubt).
2. You created a procedure using the "Player right-clicked on entity" trigger.

If this is the second case, you need to replace the blocks associated with the player from "Event/Target Entity" to "Source Entity", it is located in the "Minecraft Components" tab.

Could you explain in detail what trigger you're using and which parts of the procedure aren't working? Could you send a screenshot, if possible?

There's a problem in the Event/Trigger Entity. Right now, the trigger only accepts the player variable and substitutes it into the Event/Target Entity, so this doesn't work, since the chest is already a different Entity that is not provided for by the trigger. In your case, you can do one of two things:

1. Replace the trigger with "Player right-clicks on an entity". In this case, you will need to check the key in player hand using Source Entity, and check the chest through Event/Target Entity.
2. Leave the same trigger but: Check the key using Event/Target Entity, but then you'll have to work with raycasting and check for the chest through it.

I recommend using the first option as it is easier.